diff mbox series

[5/6] hw_random: break out of hwrng_fillfn if current rng is not trusted

Message ID 20220124202951.28579-5-linux@dominikbrodowski.net
State Accepted
Commit f4f7c153a61782f3fb259d0f39aab91444e555d9
Headers show
Series [1/6] hw_random: explicit ordering of initcalls | expand

Commit Message

Dominik Brodowski Jan. 24, 2022, 8:29 p.m. UTC
For two reasons, current_quality may become zero within the rngd
kernel thread: (1) The user lowers current_quality to 0 by writing
to the sysfs module parameter file (note that increasing the quality
from zero is without effect at the moment), or (2) there are two or
more hwrng devices registered, and those which provide quality>0 are
unregistered, but one with quality==0 remains.

If current_quality is 0, the randomness is not trusted and cannot help
to increase the entropy count. That will lead to continuous calls to
the hwrngd thread and continuous stirring of the input pool with
untrusted bits.

Cc: Matt Mackall <mpm@selenic.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
---
 drivers/char/hw_random/core.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c
index 9405fcdace38..bc9f95cbac92 100644
--- a/drivers/char/hw_random/core.c
+++ b/drivers/char/hw_random/core.c
@@ -429,6 +429,9 @@  static int hwrng_fillfn(void *unused)
 	while (!kthread_should_stop()) {
 		struct hwrng *rng;
 
+		if (!current_quality)
+			break;
+
 		rng = get_current_rng();
 		if (IS_ERR(rng) || !rng)
 			break;